Wrench



June 26;, 192s. Y 1,675,064

C. STONE WRENCH med Jan. 291, A1925 Patented June 26, 1928.

UNITED STATES PATENT OFF-ICE.

WRENCH.

Application nled January 29, 1926. Serial No. 84,597.

My invention relates to wrenches and more particularly to a wrench thatis adapted to grip round headed bolts, screws, or similar members thateither originally were rounded or that lost their polygonal shape due tohard usage.

It is a purpose of my invention to provide a socket wrench that isadapted to remove or put in position screws, bolts or similar membershaving heads that are not provided with suiciently flattened faces to beturned by means of an ordinary socket wrench and which is adapted to beused in extremely small spaces.` The invention acordingly contemplatesproviding a wrench that is extremely compact and preferably alsoextemely simple in construction.

Other objects and advantages of the invention will appear as thedescription of the accompanying drawings proceeds. However, I desire tohave it` distinctly understood that I do not intend to limit myself tothe exact details shown or described, but that I intend to include aspart of my invention all such obvious changes and modifications of partsas would occur to a person skilled in this art and as would fall withinthe scope of the claim.

' In the drawings: l

Fig. 1 is a side elevation partly in'section of my improved wrench; andFig. 2 is a section taken on the line 2-2 of Fig. 1.

Referring in detail to the drawings, my improved wrench comprises a bodyportion 5 which is shown as being made up of two substantially cupshaped members 6 and 7 held .together by means of the bolts or otherfastening members 8 and providing a chamber 9 within the same. Each ofthe members 6 and 7 is provided with an opening 10 which openings 10align when the parts are in assembled relation and in which the shaftmember 11- is journaled. Said 'shaft member 11 forms the shank portionof the tool and is provided at the outer end thereof with a cross pieceor handle 12. Formed on or secured on shaft 11 in any desired manner soas to rotate therewith, is a cam member 13 l which has a generallycylindrical outline and whose center of. curvature is eccentric to theaxis ofthe shaft 11. The member 13 is provided with a plurality ofserrations or teeth 14 running parallel to the axis of the shaft 11 onthe portion thereof that is spaced the furthest away from the axis ofthe shaft 11 as will be evident from Fig. 2.

The sections 6 andI 7 have lateral extensions 15 thereon that haveopenin s extending entirely through the same in icated by the numeral 16forming a socket member that communicates with the chamber 9 as will beevident from Fig. 2. It will be noted that the outer portions of thewalls of openings 16 form extensions of the walls of the-extensions 15.The Wall of the socket thus formed opposite the communicating openingbetween the chamber 9 and the openings 16 is provided with teeth orserrations 17 which also extend substantially parallel to the axis ofthe shaft l1.

In operation the handle 12 is turned so that the shaft 11 is in such aposition that the toothed portion 14 of the member 13 is out ofalignment with the openings 16, and a headed fastening member thatcannot be gripped by an ordinary socket wrench such as the bolt or screw18 having `a rounded head 19, is then engaged by the'wrench by passingthe socket portion of the wrench over the head 19. Then the handleportion 12 is turned rotating the cam member 13 until the teeth 14firmly engage with the head 19 thus gripping the head 19, the toothedportion 14 and the toothed portion 17 preventing rotation of the wrenchon the head of the fasteningmember that it is desiredto turn. Furtherrotation of the handle 12 thenturns the member 18 in the desireddirection. It is obvious that the handle can be rotated in eitherdirection to engage the cam with the headed fastening or otherscrew-threaded member that is to be turned, the cam 13 being rotatableentirely around the axis of the4 shaft 11 in the chamber 9 so that nomatter what the osition thereof may be by placing the wrenc over themember that is to be turned, and rotating the handle 12 in the4direction, that it is desired to turn the screw-threaded member, thecam 13 will first move into engagement with said member that is to berotated and will then turn the same as stated above.

I desire to claim and secure by United States Letters Patent is:

In a wrench of' the character described, a hollow body portion having asocket therein, a shaft rotatabl mounted in said body portion projectingt erefrom to form an op- Having thus described my invention what eratinghandle and a. cam member mounteam member except where it projects intoed on said shaft to rotate therewith, vsaid said socket. cam memberbeing eccentrically mounted on In Witness whereof, I hereunto subscribe10 said shaft and having gripping teeth theremy name this 21st day ofJanuary A. D.,v

5 on whereby a member in slaid socket may be 1926. f

gripped and turned by rotation of said shaft,

said body portion completely housing said CHARLES STONE.

